OUTLINE: This is a multicenter study. Patients receive glufosfamide IV over 60 minutes on day 1. Treatment repeats every 3 weeks in the absence of disease progression or unacceptable toxicity. Patients with stable disease receive treatment for a minimum of 6 months or until progression. Patients with an objective complete response receive a maximum of 2 additional courses of treatment after confirmation of response. Patients are followed every 6 weeks until progression.